/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.zookeeper.server;

import java.io.ByteArrayInputStream;
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.IOException;
import java.text.DateFormat;
import java.util.Date;
import java.util.zip.Adler32;
import java.util.zip.Checksum;

import org.apache.jute.BinaryInputArchive;
import org.apache.jute.InputArchive;
import org.apache.jute.Record;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.zookeeper.server.persistence.FileHeader;
import org.apache.zookeeper.server.persistence.FileTxnLog;
import org.apache.zookeeper.server.util.SerializeUtils;
import org.apache.zookeeper.txn.TxnHeader;

public class LogFormatter {
	private static final Logger LOG = LoggerFactory.getLogger(LogFormatter.class);

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		if (args.length != 1) {
			System.err.println("USAGE: LogFormatter log_file");
			System.exit(2);
		}
		FileInputStream fis = new FileInputStream(args[0]);
		BinaryInputArchive logStream = BinaryInputArchive.getArchive(fis);
		FileHeader fhdr = new FileHeader();
		fhdr.deserialize(logStream, "fileheader");

		if (fhdr.getMagic() != FileTxnLog.TXNLOG_MAGIC) {
			System.err.println("Invalid magic number for " + args[0]);
			System.exit(2);
		}
		System.out.println("ZooKeeper Transactional Log File with dbid " + fhdr.getDbid() + " txnlog format version "
				+ fhdr.getVersion());

		int count = 0;
		while (true) {
			long crcValue;
			byte[] bytes;
			try {
				crcValue = logStream.readLong("crcvalue");

				bytes = logStream.readBuffer("txnEntry");
			} catch (EOFException e) {
				System.out.println("EOF reached after " + count + " txns.");
				return;
			}
			if (bytes.length == 0) {
				// Since we preallocate, we define EOF to be an
				// empty transaction
				System.out.println("EOF reached after " + count + " txns.");
				return;
			}
			Checksum crc = new Adler32();
			crc.update(bytes, 0, bytes.length);
			if (crcValue != crc.getValue()) {
				throw new IOException("CRC doesn't match " + crcValue + " vs " + crc.getValue());
			}
			TxnHeader hdr = new TxnHeader();
			Record txn = SerializeUtils.deserializeTxn(bytes, hdr);
			System.out.println(
					DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.LONG).format(new Date(hdr.getTime()))
							+ " session 0x" + Long.toHexString(hdr.getClientId()) + " cxid 0x"
							+ Long.toHexString(hdr.getCxid()) + " zxid 0x" + Long.toHexString(hdr.getZxid()) + " "
							+ TraceFormatter.op2String(hdr.getType()) + " " + txn);
			if (logStream.readByte("EOR") != 'B') {
				LOG.error("Last transaction was partial.");
				throw new EOFException("Last transaction was partial.");
			}
			count++;
		}
	}
}
